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In a recent paper, Treumann and Baumjohann (2011) propose that  the contribution of dust particles  to the solar wind dynamic pressure can cause large  compressions of the Earth's magnetopause and suggest that this  occurs when Earth encounters meteoroid streams. In this paper we  estimate the contribution from charged dust particles to the solar  wind dynamical pressure, and we exclude that the dust associated to  meteoroid streams can influence the extension of the magnetopause  according to the proposed model. A sufficient  coupling to the solar wind is only expected for so-called  nanodust. However, the dynamic pressure of the nanodust is orders  of magnitudes below that of the solar wind, making it unlikely that  its variation can be observed in displacements of  the magnetopause. We also discuss the equation that the authors  use for estimating the extension of the Earth's magnetopause, and  conclude that this is not applicable due to the large gyroradius  of the nanodust. We finally note that an influence of dust on the  extension of a magnetosphere might be quite possible in other  astrophysical systems and based on other processes

Dust dynamic pressure and magnetopause displacement: reasons for non-detection